Why JSON.parse twice?

[constantingoeldel]

momenTUM-app/src/app/services/survey-data/survey-data.service.ts

Line 77 in 148b742

const studyJSON = JSON.parse(JSON.parse(JSON.stringify(values[0])));

[marcotxma]

It's weird that its even working, given that this code is trying to JSON.parse an already parsed object. I'm pretty sure the whole thing can be replaced by values[0]. I'll test it

[marcotxma]

I looked into it a bit deeper and here is what I've found, the study, a.k.a. values[0], is saved as a JSON string. Now apparently, you can stringify a JSON string (I've tested it by running JSON.stringify(JSON.stringify({a: 1, b: 2}))). This will give a strange result though. All in all, whats happening here is:

1. the values[0] JSON string gets stringified JSON.stringify(values[0])
2. the JSON stringified string, gets unstringified, resulting in a normal JSON string JSON.parse(JSON.stringify(values[0]))
3. the JSON string gets unstringified and is therefore finally a javascript object JSON.parse(JSON.parse(JSON.stringify(values[0])))

which leads to the conclusion, that this should be replaceable by JSON.parse(values[0])